Verified answer

1)

4/9 = 8/18 = 12/27  и  5/9 = 10/18 = 15/27, значит:

4/9 < 1/2 < 5/9,   где 1/2 = 9/18,

4/9 < 13/27 < 5/9  и  4/9 < 14/27 < 5/9,

2)

1/8 = 7/56 = 14/112 = 28/224,  1/7 = 8/56 = 16/112 = 32/224, значит:

1/8 < 15/112 < 1/7,

1/8 < 29/224 < 1/7,  

1/8 < 31/224 < 1/7